DONT use super glue. It doesnt flex and will eventually fall off. Use some silicone on the back and it will not fall of. Superglue is too brittle and is not made for a bumper which can occasionally flex.

I currently need to glue my headlight washer covers on as well since I don't have the cleaning system, what kind of glue did you go with? Is JBweld something I should consider? Can't risk them coming off and taking some paint